Telephone-transmitter



(No Model.)

I. J. KUSEL. TELEPHONE TRANSMITTER.

Patented Jam. '7, 1896.

PATENT r'ricn ISIDOR J. u sEL, OF ST. Louis, nissoURL,

TELEPHONE-TRANSIVHTTER.

srucrrxca'rxou formingpart of Letters PaitentNo. 552,689, dated J'a'nuary 7, 1896. Application filed April 29, 1895. Serial No. 547,598. (Nb model.)

' To all whom it may concern:

Be it known that I, ISIDOR J. KUSEL, of the city qfSt. Louis and State of Missouri, have invented certain new and useful Improve ments in Telephotie-Transmitters, of which the following is a. full, clear, and exact description, reference being hafdto the accompanying drawings, forming a part hereof.

My invention relates to an improved electric telephone-transmitter, and it consists in the novel construction, combination, and ar rangement of parts, hereinafter specified, and designated in the claim.

The object of my invention 1s to provide an improved transmitter of the class above mentioned, which will possess superior advau' tages in point of simplicity, durability, and general efficiency.

' In the drawings,

ter-box, the same having my invention ap plied thereto. Fig. 2. is a vertical sectional view taken approximately 011 the indicated line 2 2 of Fig. 1. Fig. dis a view in perspective of the pivoted arm carrying the carbon button thatl make use of in carrying out my invention. Fig. 4 is a view in perspective of one of the semicircular diaphragm-clamps.

' Fig. 5 is a cross-sectional view taken approxiconstructed of wood or analogous material and with the usual centrallyar1'anged aper- .t-ure 2.

Formed in the rear face of the front piece or door 1 is a circular depression 3, and concentric with this circular depression 3 and lying directly upon the rear face of the-door 1 is a circular metallic ring 4:.

' The diaphragm 5 which I makeuse of is constructed of a thin sheet or plate of carbon, although a common metallic diaphragm or a diaphragm made of any material that is susceptible of being vibrated by sound-waves may be made use of. This diaphragm 5 is Eigure 1 is a rear eleva -tion of the front face or door of a transmitplaced directly upon the metallic ring 4 and held rigidly inthis position by means of semicircular clamps 6, the same being constructed on "their under sides with rectangular cut&

away portions 7 that are occupied when said clamps are properly positioned by the peripheral edges of the diaphragm 5. circular diaphragm-clamps are held in proper position by ordinary screws 8 passing through apertures in said clamps, through the metal- Said semihe ring 4:,and into the material of which the door 1 is formed.

Immediately below the center of the diaj phragm 5is fixed by means of a screw 9 or in any suitable manner a U-shaped bracket 10, in the ends of which are formed oppositelyarranged screw-threaded apertures or per-fo rations 11. Passing through these oppositelyarranged apertures 11 are headed pivot-screws 12, the adjacent ends 13 of which are preferably coneeshaped. f

14 indicates a pivoted arm, the same being constructed at its lower end with an integral this fork 17 is screw-threaded, and mounted upon said screw-threaded end is a carbon but. ton 18', the same being preferably constructed with amsmooth front face adapted forcontact with the face of the diaphragm 5. The other fork 19 of the arm 14 extends outwardly and upwardly from the juncture of said pivoted arm let with the arm'17, and said arm 19 is exteriorly scrcw-threaded itsentire len gt'h.. 'A

metallic weight 20 is provided with a screw threaded bore or aperture, whereby it is mounted for adjustment upon the screwthreaded arm 19.

, 21 indicates a thin metallic bracket that is secured by means of a screw 22. or in any suit able mannerto the rear face of the 'door 1 imm'ediately above the center of the diaphragm 5. From thence saidbracket is bent outweight, thus producing a correct contact bea line drawn vertically through the my improved transmitter, as it is in electrical weight and locating the button 18 upon a bracket 10.

army and downwardly and terminates a slight distance from and directly in the rear of the carbon button18. This bracket 21 retains the carbon button 18 in its proper relation with thediaphragm 5 and prevents said button from accidentally dropping away from said diaphragm 5. Usual electrical connec; tions, such as 23 and 24, are made, one to the metallic ring 4 and the other to the Ushaped.

- t will be observed that the arm 14 and parts integral therewith. an dcarriedthereby are so pivoted as that they bodily vibrate, and an important feature of myinvention is the loca tion of the pivotal point of said arm 14. This pivotal point is located below' and slightly in the rear of the rear face of the diaphragm=-5, thus allowing the carbon button 18 on the screw-threaded arm 17 of the arm 14 to rest against the diaphragm 5 byreason of'its own contact with the diaphragm-holders 6 with which the usual conductor is connected. The button 18 constitutes the second electrode, as it is in electrical connection with the second conductor 24.

By my improved means of pivoting the arm 14 and providing the same with an adjustable screw-threaded fork of the arm14 the exact.

contact required to produce perfect results is} readily obtained.

The operation of my improved transmitter may be readily perceived, as the sound-waves vibrate thedi'aiphragm 5 in the ordinary manner and-vary the contact between said diaphragm and the carbon button, which produces variations in the current with the usual result. The pivot-screws 12 may be manipulated at any time to adjust the movement of the arm 14, and the same may be moved to.- Ward each other tocompensate for any wear that may occur. Should it'be desired to remove the diaphragm 5 at any time, the screw 22'is loosened, the bracket or arm '21 moved to one side, and the screws 8 inone of the I 'jsemicircular Y diaphragm clamps removed.

This allows said diaphragm to be readily withdrawn from its proper position.

It is obvious that the exactdetails of. con- ,7

struction herein shown may be slightly varied within the limit of mechanical skill without departing from the scope of my invention.

What I claim is- The improved telephone-transmitter, comprising a transmitting-diaphragm arranged in a vertical plane, a horizontal stationary U shaped bracket 10 fixed by ascrew9 at a point immediately beneath the edge of and extending at right angles to said diaphragmyand j haying the opposite threaded-apertures 1 1 ad-. jacent its free ends, pivot-screws 12 in said "apertures, an arm 14 havingopposit ebearings 15 at its lowerend" and pivotedfbetween the" said screws and extending upwardly andinthe" diaphragm, threaded. arms 17 and 19 formed integral withthe upper-end of said pivoted arinJhe arm 17 being horizontal and the arm 19 extending obliquely upward, a carhon-button mounted upon said arm 17-, and a wei ht 20 mounted -for adjustment upon the other one of said arms, the armS L7 and19, button and weight being located interior of a vertical line drawn through the pivot point of said pivoted arm.

, In testimony whereof I aiiix my signature in presence of two witnesses.

lSlDOR \J. KUSEL. Witnesses:

M. G. IRION, JOHN C. HIcDoN.

'wa'rdly to a point on a linewiththe center-of 1 

